离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(43)

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Where floodlights are directed outboard for specific purposes (e.g. lifeboat launching stations, installation signage, etc.) care should be taken to ensure that ‘overspill’ is minimised, without compromising the intent of the lighting requirement.
Helideck
The general lighting around a helideck is normally confined to providing adequate illumination on walkways, stairways, monitor platforms and the parking area if one is provided.
This lighting should ideally be to the same specification as the general installation / vessel lighting. The location and direction of the lighting units should be designed to minimise ‘overspill’ onto the helideck yet, at the same time, satisfactorily meeting the primary objective.
Power Supply and Control
Where general floodlighting is used on helidecks the control of this lighting should be accessible to the HLO in order that it can be immediately switched off at the request of the flight crew.
11.3.7 Obstruction Lighting
11.3.7.1 Objective
Significant structures on installations and vessels that may pose a threat to helicopters in darkness and low visibility conditions should be clearly marked with appropriately selected and positioned obstruction lights rated as noted in CAP 437. Structures that may require obstruction lighting include:
.
Flare / Vent Towers and Booms

.
Drilling Derricks

.
Radio Masts

.
Gas Turbine Exhaust support structures

.
Legs on Jack-up Rigs

.
Crane Jibs and ‘A’ Frames.

11.3.7.2 Equipment Specification & Layout
As a general rule, obstruction lights are positioned at the highest point on an obstruction and, in the case of very tall structures (e.g. flare / vent towers and radio masts) additional lights are located at approximately 10 metre intervals over the length of the structure.
Flare towers can be a problem for locating and maintaining obstruction lights.

(Photograph courtesy of Orga BV) (Photograph courtesy of Orga BV)

The obvious problems associated with high temperatures at the flare tip mean that placing an obstruction light where it is subject to extreme temperatures is not a realistic proposition.  Also, with a permanently lit flare (pilot flare in operation), there is little to be gained by installing an obstruction light at the highest point because there should be sufficient illumination at the tip for flight crews to see and avoid.
Therefore, if obstruction lights are to be fitted to the flare tower then the highest location should start at an elevation where the lights will be unaffected by radiated heat and at a point that is accessible for maintenance.
An alternative to fitting obstruction lights on the flare structure is to flood light it from a lower elevation. For instance, on an FPSO, locating the floodlight on top of the ‘Turret’ may provide both a convenient and effective position to achieve a good result.
　
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